linux/sound/ac97_bus.c
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   1/*
   2 * Linux driver model AC97 bus interface
   3 *
   4 * Author:      Nicolas Pitre
   5 * Created:     Jan 14, 2005
   6 * Copyright:   (C) MontaVista Software Inc.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/device.h>
  17#include <linux/string.h>
  18#include <sound/ac97_codec.h>
  19
  20/*
  21 * Let drivers decide whether they want to support given codec from their
  22 * probe method.  Drivers have direct access to the struct snd_ac97 structure and may
  23 * decide based on the id field amongst other things.
  24 */
  25static int ac97_bus_match(struct device *dev, struct device_driver *drv)
  26{
  27        return 1;
  28}
  29
  30#ifdef CONFIG_PM
  31static int ac97_bus_suspend(struct device *dev, pm_message_t state)
  32{
  33        int ret = 0;
  34
  35        if (dev->driver && dev->driver->suspend)
  36                ret = dev->driver->suspend(dev, state);
  37
  38        return ret;
  39}
  40
  41static int ac97_bus_resume(struct device *dev)
  42{
  43        int ret = 0;
  44
  45        if (dev->driver && dev->driver->resume)
  46                ret = dev->driver->resume(dev);
  47
  48        return ret;
  49}
  50#endif /* CONFIG_PM */
  51
  52struct bus_type ac97_bus_type = {
  53        .name           = "ac97",
  54        .match          = ac97_bus_match,
  55#ifdef CONFIG_PM
  56        .suspend        = ac97_bus_suspend,
  57        .resume         = ac97_bus_resume,
  58#endif /* CONFIG_PM */
  59};
  60
  61static int __init ac97_bus_init(void)
  62{
  63        return bus_register(&ac97_bus_type);
  64}
  65
  66subsys_initcall(ac97_bus_init);
  67
  68static void __exit ac97_bus_exit(void)
  69{
  70        bus_unregister(&ac97_bus_type);
  71}
  72
  73module_exit(ac97_bus_exit);
  74
  75EXPORT_SYMBOL(ac97_bus_type);
  76
  77MODULE_LICENSE("GPL");
  78
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